Proportional plotting device



FIG. 1 is a top front isometric view of a proportional plotting device showing my new design;

FIG. 2 is a fragmentary cross-section taken on line 2--2 of FIG. 1;

FIG. 3 is an enlarged top plan view of FIG. 1 with portions fragmentarily shown for convenience of illustration;

FIG. 4 is a right end elevation thereof;

FIG. 5 is a left end elevation thereof;

FIG. 6 is a fragmentary front elevation of the movable block separately shown for clarity of illustration;

FIG. 7 is a fragmentary rear elevation of the fixed block shown separately for clarity of illustration; and

FIG. 8 is a fragmentary bottom plan view of the right hand side of FIG. 3. 

The ornamental design for a proportional plotting device, as shown and described. 